html{font-size:62.5%; /* 10÷16=62.5% */;padding: 0;margin: 0;height: 100%;}
body,h1,h2,h3,h4,h5,h6,hr,p,blockquote,dl,dt,dd,ul,ol,li,pre,
form,fieldset,legend,button,input,textarea,th,td,section,p,span,font,div{
    /*font-size:14px;*/
    font-size:1.5rem;
    margin:0;
    padding:0;    
}